JP3012179B2 - String-like elastomer composite suitable for long-term use as packing, sealing, and cushioning materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a low specific gravity, flexible,
It relates to a string-like elastomer composite that is formed by covering and integrating the entire outer peripheral surface of an elastomer foam having excellent heat insulation and cushioning properties with an elastomer non-foam having excellent resilience, abrasion resistance, and rebound resilience. Yes, specifically, a long cord that can effectively prevent deterioration of restorability, abrasion resistance, and cushioning property when used for a long time as a packing material, a sealing material, a cushioning material, and the like. The present invention relates to an elastomer composite in the form of a solid. In addition, the elastomer foam here means a general rubber product having a low apparent specific gravity having a cellular structure such as sponge rubber or foam rubber, so-called cellular rubber,
Elastomer non-foam means ordinary solid rubber having no cellular structure.

[0002] The elastomer composite of the present invention is used for sealing or cushioning of buildings, civil engineering, vehicles, electric machines, OA equipment, information equipment, medical equipment, furniture, refrigeration equipment, lighting equipment, general machinery, etc. It is suitable for use as a support and a transfer member, and is further used under severe environmental conditions such as being exposed to wind and rain outdoors such as various vending machines and various control panels. Prevention and buffering of wind and rain into equipment, prevention of insects and small animals from entering the equipment, prevention of intrusion of seawater, etc. due to waves into ship hatches, etc., and penetration of rain and rain into structures such as bridges Prevention and metal corrosion prevention, waterproof packing at the joint of concrete structures, simple oil fence over water (no internal pressure required), embankment
It is suitable for use for maintaining watertightness of a floodgate, a tide gate, an irrigation gate, and the like.

[0003]

2. Description of the Related Art Conventionally, as packing materials, sealing materials and cushioning materials for industrial use, civil engineering construction, building materials, etc., uncoated or ultra-thin-coated elastomer foams and structural innovations have been devised. In many cases, an elastomer non-foam is used. What is necessary for such a packing material, a sealing material, and a cushioning material is as a packing material, a sealing material, and a cushioning material, especially when used for a long period of time under severe environmental conditions such as being exposed to the weather outdoors. Of the surface, such as restorability after long-term compression, mechanical properties of the surface such as abrasion resistance, and deterioration of cushioning properties, and can withstand long-term use. It is.

[0004]

However, when an uncoated or ultra-thin-coated elastomer foam is used for the packing material, the sealing material, and the cushion material, resilience is higher than that of an elastomer non-foam material. In addition to being inferior in terms of elasticity and abrasion resistance, when used after being compressed for a long period of time, it is difficult to completely restore it, or the surface layer of the foam adheres to the compressed facing surface and is easily broken. Have drawbacks,
On the other hand, when an elastomer non-foamed material is used as the packing material or the like, it has a drawback that the specific gravity is high and the cutting property, cushioning property, and flexibility are poor.

Accordingly, an object of the present invention is to optimize the open cell ratio and apparent specific gravity of the elastomer foam, the tensile strength and the rubber hardness of the elastomer non-foam, and to optimize the structure of the elastomer composite. By trying to
Especially as a packing material, a seal material, and a cushion material, even when used for a long period of time under severe environmental conditions such as being exposed to the wind and rain outdoors, the restorability after compression, abrasion resistance,
Another object of the present invention is to provide a string-like elastomer composite having good cushioning properties.

[0006]

In order to achieve the above object, a cord-like elastomer composite of the present invention comprises a cord-like elastomer foam which is entirely covered with an elastomer non-foam. The foam has an open cell ratio in the range of 10 to 40%, an apparent specific gravity in the range of 0.15 to 0.75, and the elastomer non-foam has a tensile strength of 70 kgf / cm.
² or more, the rubber hardness is in the range of 30 to 60 °, and in the cross section of the elastomer composite, the thickness of the elastomer non-foam is
0.5 mm or more, and the area ratio of the elastomer non-foamed body to the cross section is 70% or less.

[0007] The open cell ratio is ASTM D 1940-62T
Sample volume V _S , elastomer volume V _R , volume change ΔV according to the Remington Pariser method described in
Was measured, and the open cell ratio was calculated by substituting these values into the following equation. Formula: (V _S -ΔV) / (V _S -V _R ) × 100 Rubber hardness was measured with an A-type hardness tester according to the test method of JIS K6301. The compressive residual strain rate was determined by performing a compressive residual strain test (temperature: 70 ° C, heating time: 22 hours, compression ratio: 50%) according to the test method of JIS K6382, and determining the initial thickness t ₀ (mm) of the specimen. The thickness t ₁ (mm) of the test piece after the test was measured, and these values were substituted into the following equation to calculate a compressive residual strain rate C (%). Formula: C = (t ₀ −t ₁ ) / t ₀ × 100

In the case where it is necessary to improve the workability of attaching the string-shaped elastomer composite to a predetermined portion while folding, bending, or temporarily fixing the same,
In the cross section of the elastomer composite, it is preferable that the thickness of the elastomer non-foamed material be 5% or more thicker in a portion corresponding to 20 to 50% of the entire outer peripheral length than in the remaining portion.

[0009]

FIG. 1 shows a cross section of a typical elastomer composite according to the present invention, wherein 1 is an elastomer composite, 2 is an elastomer foam, and 3 is an elastomer non-foam 3. The elastomer composite 1 of FIG.
The entire outer peripheral surface of the long string-shaped elastomer foam 2 is covered with the elastomer non-foam 3 and has a rectangular cross-sectional shape.

In the elastomer composite 1, the thickness t _a to t _d of the elastomer non-foamed body 3 in its cross section is set to 0.5 mm or more in all portions corresponding to the outer peripheral length a + b + c + d. The area ratio of the body 3 to the cross section is set to 70% or less. Elastomer non-foam 3
If the thickness is less than 0.5 mm, sufficient mechanical properties such as wear resistance cannot be obtained, and if the area ratio of the elastomer non-foamed body 3 to the cross section exceeds 70%,
This is because there is no difference from the various physical properties of the single-structured elastomer non-foamed body 3 and the significance of the composite is lost.

Another object of the present invention is to maintain good resilience even after compression for a long period of time. For this purpose, the compression set strain of the elastomer composite 1 is set to 60%. %.

In order to reduce the residual compression set of the elastomer composite 1 to 60% or less, the elastomer foam 2
In addition, the material and structure of the elastomer non-foamed body 3 were optimized. The elastomer foam 2 has an open cell ratio of 10
The apparent specific gravity is in the range of 0.15 to 0.75. If the proportion of open cells exceeds 40%, satisfactory rubber elasticity cannot be obtained, and if it is less than 10%, the residual compression ratio becomes too large, causing a problem in resilience. If the specific gravity exceeds 0.75, the effect that the specific gravity can be reduced as compared with the elastomer non-foamed material is reduced, and the advantage of using the elastomer non-foamed material 3 is reduced. This is because the ratio becomes too large, causing a problem in restoring property, and physical properties are also deteriorated.

Specifically, natural rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, chloroprene rubber, butadiene rubber, which are generally used in the past,
By using ethylene propylene rubber, acrylic rubber, epichlorohydrin rubber, silicone rubber, chlorosulfonated polyethylene rubber, fluorine-based rubber, etc., alone or in a blend of two or more, by adjusting the composition and the foaming agent etc. It is preferable that the open cell ratio and the apparent specific gravity of the elastomer foam 2 are set so as to be within the above ranges.

The elastomeric non-foamed body 3 has a tensile strength of 70 kgf / cm ² or more and a rubber hardness of 30 to 60 °. If the tensile strength is less than 70 kgf / cm ² , sufficient physical strength and abrasion resistance cannot be obtained, and if the rubber hardness exceeds 60 °, the flexibility, cushioning property, and rebound resilience are sufficient. This is because when the rubber hardness is less than 30 °, problems arise in abrasion resistance and resilience.

More specifically, natural rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, chlorobrene rubber, butadiene rubber, ethylene propylene rubber, and the like generally used in the same manner as the elastomer foam are used.
Acrylic rubber, epichlorohydrin rubber, silicone rubber, chlorosulfonated polyethylene rubber, fluorine-based rubber, or the like is used alone or in a blend of two or more, and by adjusting the compounding composition thereof, the elastomer non-foam 3 It is preferable that the tensile strength and the rubber hardness are set within the above ranges.

In addition, long or short products are folded,
When it is necessary to improve the workability when attaching to a predetermined part while performing bending processing or temporary fixing processing, the thickness of the elastomer non-foamed body 3 in the cross section of the elastomer composite 1 is determined by the outer periphery thereof. Of the total length a + b + c + d, 20
The thickness t _a of the portion corresponding to 50%, it is preferable to increase the thickness more than 5% relative to the thickness t _b ~t _d of rest.
This is because, in the case where the cross section is a polygon such as a rectangle or a shape such as a circle, various processes are greatly facilitated by providing a partial thickness difference in the elastomer non-foamed body 3, thereby improving working efficiency. This is because a significant improvement can be achieved.

In FIG. 1, for convenience of explanation, an elastomer composite having a rectangular cross section has been described as an example. However, the shape is not particularly limited to this, and various shapes can be adopted. A specific example is shown in FIGS.

The elastomer composite 1 according to the present invention having the above-mentioned structure has the resilience, abrasion resistance, rebound resilience and the like of the elastomer non-foam 3 and the low specific gravity, flexibility and heat insulating properties of the elastomer foam 2. , Cushioning properties, etc., and also excellent workability in various assemblies.

[0019]

EXAMPLES Next, examples of the string-like elastomer composite according to the present invention will be described. Elastomer composite 1
Has a cross-sectional configuration as shown in FIG.
It has a square shape with corners, and is formed by covering the entire outer peripheral surface of a long cord-like sponge rubber 2 with a solid rubber 3 and integrating them. In addition, among the thicknesses t _a to t _d of the solid rubber 3, the thicknesses t _{b to} t _d are all the same, and only t _a is replaced by t
It was thicker than _b ~t _d.

The elastomer composite 1 is prepared by extruding an unvulcanized solid rubber and an unvulcanized sponge rubber by a double extruder with a 50 mm and 70 mm extruder, respectively, so that the outer peripheral surface of the sponge rubber is solid rubber. After passing through a hot-air vulcanizing tank (230 ° C x 6 minutes or more), continuous vulcanization molding is performed, and sponge rubber and solid rubber are integrated to form a long cord. Was produced.

As shown in Table 1, the solid rubber was produced by kneading eight kinds of rubbers mixed at mixing ratios A to H with 16 inch open rolls each having a surface temperature of 70 ° C. for 30 minutes. As shown in Table 2, the sponge rubber was manufactured by kneading a mixture of seven kinds of mixing ratios I to O with an 18-inch open roll having a surface temperature of 70 ° C. for 30 minutes. Table 1 shows the specific gravity, tensile strength, rubber hardness, and compression set of the vulcanized solid rubber, and Table 2 shows the apparent specific gravity and open cell ratio of the vulcanized sponge rubber. , And the compressive residual strain are also shown.

[0022]

[Table 1] Reference examples of the above composition components (1) to (26) (1) Ethylene propylene rubber # 778 (manufactured by Idemitsu DSM Co., Ltd.) (2) Ethylene propylene rubber # 4903 (manufactured by Idemitsu DSM Co., Ltd.) (3) Chloroprene rubber Y20 (manufactured by Tosoh Corporation) (4) Chloroprene rubber B-10 (manufactured by Tosoh Corporation) (5) Silicone rubber MM3531 (manufactured by Wacker Chemicals East Japan) (6) Silicone rubber MM7512 (manufactured by Wacker Chemicals East Japan Co., Ltd.) (7) Camellia (manufactured by NOF Corporation) (8) Mug # 150 (manufactured by Kyowa Mag Co., Ltd.) (9) No. 3 zinc flower (Seido Chemical) (10) Asahi # 60 (Asahi Carbon Co., Ltd.) (11) Asahi # 35 (Asahi Carbon Co., Ltd.) (12) Silver W (Shiraishi Calcium Co., Ltd.) (13) PW380 (Idemitsu Petrochemical Co., Ltd.) (14) NS-24 (Idemitsu Petrochemical Co., Ltd.) (15) Vesta # 18 (Inoue Lime ( (16) Structor WB16 (manufactured by S & S Corporation) (17) Black Sub # 21 (manufactured by Tenma Sub Kako Co., Ltd.) (18) 2.4. Dichlorobenzoyl peroxide (Waker Chemicals East Japan ( (19) Dicumyl peroxide (manufactured by Wacker Chemicals East Japan KK) (20) PEG # 4000 (manufactured by NOF Corporation) (21) Noxeller M (Ouchi Shinko Chemical Co., Ltd.) (22) Noxeller TRA (Ouchi Shinko Chemical Co., Ltd.) (23) Noxeller BZ (Ouchi Shinko Chemical Co., Ltd.) (24) Noxeller TE (Ouchi Shinko Chemical Co., Ltd.) (25) Noxeller EUR (Ouchi Shinko Chemical Co., Ltd.) (26) Sulfax A (Tsurumi Chemical Co., Ltd.)

[0023]

[Table 2]

As shown in Table 3, the elastomer composite was selected from one kind of solid rubber selected from the compounding ratios A to H shown in Table 1 and from the compounding ratios I to O shown in Table 2. A total of 17 types of elastomer composites (Nos. 1 to 17) were manufactured by combining with one type of sponge rubber, and their performance was evaluated. In Table 3, the solid rubber having a single structure (No. 18) and the sponge rubber having a single structure (No. 19) are also shown for comparison with the elastomer composite.

The elastomer composites (Nos. 1 to 17) thus produced were subjected to a test for evaluating the resilience, abrasion resistance, and cushioning properties after long-term compression.

The resilience after long-term compression is determined by the above-mentioned compression residual strain test, with the initial thickness t ₀ (mm) of the test piece,
The thickness t ₁ (mm) of the test piece after the test was measured, and these values were substituted into the above-mentioned equation to obtain a compression residual strain C
(%) Was calculated, and when this value was 60% or less, it was evaluated as good, and when it exceeded 60%, it was evaluated as reject. The abrasion resistance was measured by the Akron abrasion test (A-1 method) described in JIS K6264, and the value of the abrasion volume per 1,000 revolutions of the abrasion wheel (cc / 1000 times) was determined.
A case of 30 or less was evaluated as good, and a case of more than 0.30 was evaluated as unacceptable. The cushioning property was evaluated by feeling by 50 randomly selected persons, and was evaluated as “○” when good and “x” when poor. In addition, for reference, the mountability was also evaluated on a three-point scale of “◎ ××”. Attachment was made by assembling various elastomer composites to 50 randomly selected persons at the corners bent at 90 ° by 10 mm in length and width, and evaluated the ease of assembling at this time in four steps. From the results, the mountability was evaluated. Table 3 shows the results of these tests.

[0027]

[Table 3]

From the results shown in Table 3, Nos. 1 to 8 of the present invention examples are as follows:
Restoring property after long time compression, abrasion resistance, and has good cushioning both also, Nanba1～7 5% or more than the thickness t _a of the elastomeric non-foam t _b ~t _d Because it is thicker, it also has better mounting properties than No. 8. On the other hand, among the Nos. 9 to 19 of the comparative examples, Nos. 9 to 16 in which at least one of the compounding ratio of the solid rubber and the compounding ratio of the sponge rubber are out of the proper range, the restorability after long-term compression. No. 17 in which at least one of wear resistance and cushioning property is insufficient, and No. 17 in which the area ratio of solid rubber is larger than an appropriate range, cushioning property is poor. In addition, No. 18 made of a single-structured solid rubber was poor in cushioning properties and mountability, and No. 19 made of a single-structured sponge rubber was poor in wear resistance and mountability. In this example (Nos. 1 to 17), the case where the elastomer composite was formed by combining the same type of solid rubber and sponge rubber was shown, but different types of rubbers may be combined with each other, depending on the application. It is possible to combine various rubbers.

[0029]

According to the present invention, the string-like elastomer composite is
Suitable for sealing and cushioning of construction, civil engineering, vehicles, electric machines, OA equipment, information equipment, medical equipment, furniture, refrigeration equipment, lighting equipment, general machinery, etc., and also as a support and transfer member thereof. In addition, when used under severe environmental conditions such as exposed to wind and rain outdoors such as equipment such as various vending machines and various control panels,
Prevention and buffering of rain and rain into equipment, prevention of insects and small animals from entering equipment, prevention of intrusion of seawater, etc. by waves into hatches for ships, prevention of rain and rain from entering structures such as bridges, and metals Anti-corrosion, watertight packing at joints of concrete structures, simple oil fence over water (no internal pressure required),
It is suitable to be used for maintaining watertightness of dams, sluice gates, tide gates, irrigation sluice gates, etc. In addition, it can be used for copier rollers and widely used in various industrial fields. It is expected to be.

[Brief description of the drawings]

FIG. 1 is a perspective view mainly showing a cross section of a typical elastomer composite according to the present invention.

FIG. 2 is a perspective view showing various cross-sectional shapes of the elastomer composite.

FIG. 3 is a perspective view showing various cross-sectional shapes of the elastomer composite.

[Explanation of symbols]

 1 Elastomer composite 2 Elastomer foam 3 Elastomer non-foam 4 Cavities

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor's Middle Affairs Definition 3172-4 Nishi-Oshima, Kasaoka City, Okayama Prefecture (72) Toshinobu Hanasaki 430-9, Kaya, Tsunogo-cho, Fukuyama City, Hiroshima Prefecture (56) References JP Hei 8-302335 (JP, A) Japanese Utility Model Showa 57-132856 (JP, U) Japanese Utility Model Showa 47-28875 (JP, U) Japanese Utility Model Showa 63-24249 (JP, U) (58) Fields surveyed (Int) .Cl. ⁷ , DB name) B32B 1/00-35/00 C09K 3/10-3/12 F16J 15/00-15/14

Claims (2)

(57) [Claims] 1. A string-shaped elastomer composite in which the entire outer peripheral surface of a string-shaped elastomer foam is covered and integrated with an elastomer non-foam, wherein the elastomer foam has an open cell ratio of 10 to 40%. range, in the range of apparent specific gravity is 0.15 to 0.75, the elastomeric non-foam, a tensile strength of 70 kgf / cm ² or more, the range of rubber hardness of 30 to 60 °, the cross-section of the elastomer composite The thickness of the elastomer non-foamed body is 0.5 mm or more, and the area ratio of the elastomer non-foamed body to the cross section is 70% or less. A string-like elastomer composite with excellent abrasion and cushioning properties. 2. The method according to claim 1, wherein the thickness of the elastomer non-foamed body is increased by 5% or more in a portion corresponding to 20 to 50% of the outer peripheral length thereof as compared with the remaining portion. The string-shaped elastomer composite according to the above.